/**
 * #      981
 * 名称   基于时间的键值存储
 * 链接   https://leetcode-cn.com/problems/time-based-key-value-store
 * 题解   [46](https://leetcode-cn.com/problems/time-based-key-value-store/solution)
 * 通过率 41.9%
 * 难道   中等
 */

